RegisterType not in Autofac 2.3.2?

Using AutoFa开发者_运维知识库c 2.3.2, I am trying to do the following:

var builder = new Autofac.ContainerBuilder();
builder.RegisterType<SomeDependency>().As<IDependency>();

RegisterType is not there. Not seeing it with intellisense, compiler doesn't know it's there. Looking in the help shows that the RegisterType method is an extension method. Is there something I'm missing? Why is this extension method not showing up?

I'm using VS2010, attempting the above code in a test project and a web application project.

You need to use use Autofac or use the static method directly.

use Autofac;
namespace X
{
   builder.RegisterType<MyType>();
}

or

Autofac.RegistrationExtensions.RegisterType<MyType>(builder);